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  <title>Update the current session id with a newly generated one</title>

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</div><hr /><div id="function.session-regenerate-id" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">session_regenerate_id</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.2, PHP 5)</p><p class="refpurpose"><span class="refname">session_regenerate_id</span> &mdash; <span class="dc-title">
   Update the current session id with a newly generated one
  </span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.session-regenerate-id-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>session_regenerate_id</strong></span>
    ([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$delete_old_session</code><span class="initializer"> = false</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>session_regenerate_id()</strong></span> will replace the current
   session id with a new one, and keep the current session information.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.session-regenerate-id-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">delete_old_session</code></em></dt>

      <dd>

       <p class="para">
        Whether to delete the old associated session file or not.
       </p>
      </dd>

     
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.session-regenerate-id-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.session-regenerate-id-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>4.3.3</td>
       <td>
        Since then, if session cookies are enabled, use of
        <span class="function"><strong>session_regenerate_id()</strong></span> will also submit a new
        session cookie with the new session id.
       </td>
      </tr>

      <tr>
       <td>5.1.0</td>
       <td>
        Added the <em><code class="parameter">delete_old_session</code></em> parameter.
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.session-regenerate-id-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4671">
    <p><strong>Example #1 A <span class="function"><strong>session_regenerate_id()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />session_start</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$old_sessionid&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">session_id</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">session_regenerate_id</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">$new_sessionid&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">session_id</span><span style="color: #007700">();<br /><br />echo&nbsp;</span><span style="color: #DD0000">"Old&nbsp;Session:&nbsp;</span><span style="color: #0000BB">$old_sessionid</span><span style="color: #DD0000">&lt;br&nbsp;/&gt;"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #DD0000">"New&nbsp;Session:&nbsp;</span><span style="color: #0000BB">$new_sessionid</span><span style="color: #DD0000">&lt;br&nbsp;/&gt;"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$_SESSION</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.session-regenerate-id-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.session-id.html" class="function" rel="rdfs-seeAlso">session_id()</a> - Get and/or set the current session id</span></li>
    <li class="member"><span class="function"><a href="function.session-start.html" class="function" rel="rdfs-seeAlso">session_start()</a> - Start new or resume existing session</span></li>
    <li class="member"><span class="function"><a href="function.session-name.html" class="function" rel="rdfs-seeAlso">session_name()</a> - Get and/or set the current session name</span></li>
   </ul>
  </p>
 </div>


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